## MSC #21 – Using the Average: The product of the Sum and Difference

Last Wednesday evening, I came across a Youtube video “A different Way To Solve Quadratic Equations” at https://www.youtube.com/watch?v=ZBalWWHYFQc) published just last Dec 12, 2019 by Po-Shen Loh, a Carnegie Mellon Math Professor and current ISA Math Olympiad coach. I found…